Sterling Infrastructure, Inc. (STRL) director sells 4,500 shares in planned trade

Rhea-AI Filing Summary

STERLING INFRASTRUCTURE, INC. director Julie Dill sold 4,500 shares of common stock in an open-market transaction at an average price of $384.2768 per share on March 9, 2026. The sale was executed under a Rule 10b5-1 trading plan adopted on December 2, 2025.

After this transaction, she directly holds 17,853 shares of common stock, including 751 shares that are subject to restrictions on sale, transfer, or potential forfeiture under certain conditions. The trades were completed in multiple executions at prices ranging from $381.00 to $387.21 per share.

Insider Trade Summary

Net Seller: 4,500 shares ($1,729,246)

Net Sell 1 txn

Insider Dill Julie

Role Director

Sold 4,500 shs ($1.73M)

Type	Security	Shares	Price	Value
Sale	Common Stock	4,500	$384.2768	$1.73M

Holdings After Transaction: Common Stock — 17,853 shares (Direct)

Footnotes (1)

1. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 2, 2025. Transaction executed in multiple trades at prices ranging from $381.00 to $387.21 per share, inclusive. The price reported in column 4 above reflects the average sale price per share. The Reporting Person hereby undertakes to provide the SEC staff, the Issuer or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote. Of these shares, 751 shares are subject to restrictions on their sale or other transfer and to forfeiture under certain circumstances.

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Dill Julie

(Last) (First) (Middle)

1800 HUGHES LANDING BLVD

SUITE 250

(Street)

THE WOODLANDS TX 77380

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
STERLING INFRASTRUCTURE, INC. [ STRL ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
03/09/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/09/2026		S		4,500(1)	D	$384.2768(2)	17,853(3)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 2, 2025.

2. Transaction executed in multiple trades at prices ranging from $381.00 to $387.21 per share, inclusive. The price reported in column 4 above reflects the average sale price per share. The Reporting Person hereby undertakes to provide the SEC staff, the Issuer or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote.

3. Of these shares, 751 shares are subject to restrictions on their sale or other transfer and to forfeiture under certain circumstances.

Remarks:

	Mark D. Wolf (Under a Power of Attorney)	03/09/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What insider transaction did STRL director Julie Dill report?

Julie Dill reported an open-market sale of 4,500 shares of Sterling Infrastructure common stock. The average sale price was $384.2768 per share, and the transaction date was March 9, 2026, according to the Form 4 insider filing data.

At what prices were the STRL shares sold in Julie Dill’s Form 4?

The shares were sold in multiple trades at prices ranging from $381.00 to $387.21 per share. The Form 4 reports an average sale price of $384.2768 per share for the 4,500 shares of Sterling Infrastructure common stock sold.

How many STRL shares does Julie Dill own after this reported sale?

After the reported sale, Julie Dill directly owns 17,853 shares of Sterling Infrastructure common stock. Of these, 751 shares are subject to restrictions on sale or transfer and may be forfeited under certain circumstances, as disclosed in the Form 4 footnotes.

Was the STRL insider sale by Julie Dill under a Rule 10b5-1 plan?

Yes. The Form 4 states the sales were effected under a Rule 10b5-1 trading plan adopted by Julie Dill on December 2, 2025. Such plans allow pre-arranged trading instructions, providing a structured framework for executing insider transactions over time.

What role does Julie Dill hold at Sterling Infrastructure (STRL)?

Julie Dill is identified as a director of Sterling Infrastructure, Inc. in the Form 4 insider filing. The reported transaction involves her direct holdings of the company’s common stock and reflects an open-market sale of 4,500 shares on March 9, 2026.